Hygrometric indicator, recorder, and regulator



June 30, 1925. 1,544,516

E. W. COMFORT I IY GROMET RIC INDICATOR, RECORDER, AND REGULATOR Filed July 9, 1921 2 Sheets-Sheet 1 \nvenTor Edward W.ComForT June '30, 1925.

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Edward W. ComFoTT byWMkW Patented June 30, 1925.

PATENT OFFICE.

EDWARD W. COMFORT, OF WINCHESTER, MASSACHUSETTS, ASSIGNOR TO PARKS- CRAMER COMPANY, OF CH'USETTS.

BOSTON, MASSACHUSETTS, A CORPORATION OF MASSA- HYGROMETRIC INDICATOR, RECORDER, AND RRGULATOR.

Application filed July 9, 1921.

To all whom it may comm:

Be it known that I, EDWARD W. COMFORT,

a citizen of the United States; and resident of Vinchester, county of Middlesex, State of Massachusetts, have invented an Improvement in Hygrometric Indicators, Re-

corders, and Regulators, of which the following description, in connection with the accompanying drawing, is a specification,

like parts.

This invention relates to improvements in hygrometric regulating apparatus and the object thereof is to provide an improved regulator comprising controllers movable manually or preferably automatically to positions indicative of wet and dry bulb temperatures, the movements of said controllers being caused to actuate a transformer to positions indicative of the condition of the atmosphere which is dependent upon the relation 01' the wet and dry bulb temperature, whereby said transformer may be caused to control regulating mechanism for producing or maintaining a predetermined condition of the atmosphere.

More specifically the object of the invention is to provide a regulating device operable by thermo-sensitive members which are subjected respectively to the wet and dry bulb temperatures of the atmosphere which operatecontrollers so correlated that their movements will actuate a regulating device to produce or maintain a predetermined condition of the atmosphere, such as relative humidity, or a definite percentage of moisture contentin the air, or.other conditions of the atmosphere which are dependent upon the relation of the wet bulb temperature to the dry bulb temperature.

The present invention is based upon the well known fact that various conditions or properties of the atmosphere are functions of the relation ofthe wet bulb temperature to the dry bulb temperature which substantially follow invariablelaws, for example, the condition or property of the atmosphere known as relative humidity; is a function of the wet and dry bulb temperatures which is like characters on the drawing representing Serial No. 483,466.

empirically expressed by the well known formula Tw 4 I Td 4 Ch in which,

Tw is the psychrometric wet bulb temperature in degrees Fahrenheit.

the point of intersection of the ordinates and four deabscissae representing respective? four degrees dry bulb temperature an grees wet bulb temperature.

The present invention contemplates the productlon of a regulating instrument having controllers preferably operated by thermo-sensitive motors subject respectively to the wet and dry bulb temperatures of the atmosphere, in which the controllers move in lines parallel respectively with the axis of ordinates and the axis of abscissae at predetermined distances from said axes, preferably four degrees, so that the lines of movement of said controllers intersect at a point four degrees above zero.

A transformer is provided which is subject to the conjoint action of the movements of these controllers and itself moves to po-' sitions indicative of the condition of the atmosphere. In the embodiment of the invention illustrated herein the transformer is so actuated as to be moved to positions indicative of'the relative humidity of the atmosphere and by the construction illustrated the. relative humidity can be directly indicated upon a chart. The movement of the transformer is further utilized to actuate regulating means for preferably main-- tain'ing a constant predetermined relative humidity.

A further object of the invention is to provide means for adjusting the relative movements of the controllers in order that the instrument may be properly set and calibrated.

A further object of the invention is to provide a regulating instrument of the character described in which the transformer includes means whereby the members of the regulating means, which co-operate with the transformer, may be mounted upon a stationary support.

A further important feature of the invention consists in providing adjusting means for the regulating mechanism which may be actuated from the outside of the casing containing the regulating mechanism, so that the regulating mechanism may be protected from injurious effects which frequently occur when unskilled operators attempt. to tamper with the adjustment of the instrument.

The present invention comprises certain improvements upon the indicating and regulating apparatus illustrated in my prior application No. 137,236, which is based upon the same general principle, but in which the indicatingdial and the co-operating pointer, which serves to actuate the regulating mechanism, are mounted upon and movable with the free end of one of the thermo-sensitive members. i,

In the present invention the dial, upon which the condition of the atmosphere is indicated, is rotatable upon a fixed support and the pointer, which co-oper'ates with the dial, is mounted upon a stationary pivotal support and is actuated by the transformer through a suitable flexible shaft. By this construction the regulating" means may be adjustably supported upon the inside of the casing and adjusted from the outside, thereof, so that all possibility of injury to the apparatus in substituting new dials, or inadjusting the regulating mechanism, by unskilledoperators will be avoided.

.proper attendance of the regulating and indicating mechanism.

A preferred embodiment of my invention is illustrated herein which is adapted for indicating and regulating the relative humidity of a room or enclosure, but it will be understood that by various adjustments the instrument may be employed to regulate the condition of moisture of the atmosphere in accordance with other laws which are dependent upon the relation of the wet bulb temperature to the dry bulb temperature,

such for example, as, the condition in which atmosphere, the controllers which are op erated by said members and the transformer which is operated by said controllers to actuate the indicating and regulating means, said indicating and regulating means being shown in dotted lines;

Fig. 2 is a detail view in vertical cross.

section illustrating the means for adjusting the contact plates of the regulating mechanism; i

Fig. 3 is a horizontal sectional view on line 3-3 Fig. 1 of the rear portion of the instrument as viewed from above;

Fi 4 is a vertical sectional view on line H ig. 3, viewed from the right toward the left, a portion of the transverse partition being broken away to illustrate the connection between the transformer and the indicating arm or pointer which also controls the regulating mechanism;

Fig. 5 is a detail view illustrating a modified form of transformer operable to regulate a condition of the atmosphere in accordance with a law different from that which governs the operation of the instrument illustrated in Fig. 1; and,

Fig. 6 is a detail view illustrating means by which the apparatus may be caused to actuate indicating, recording or regulating mechanism at a place remote from the instrument.

The indicating and regulating device or instrument illustrated in the accompanying drawings comprises a preferably rectangular casing having a base 1, a front 2 the upper portion of'which is provided with axglass face 3, a back 4, sides 5 and 6 and a top 7. The casing is divided by a transverse partition 8 into a front section 9 to contain the indicating and regulating mechanisms and a rear section to contain the thermo-sensitive members and controlling mechanism. T he rear section is again sub-divided by a trans verse wall 10 to form a wet bulb compart- Jnent 11 and a dry bulb compartment 12.

An aperture 13 through the upper end of the partition 10 establishes communication between the dry bulb compartment and the wet bulb compartment. Ain desirably is admitted at the lower end of the dry'bulb comment, finally discharging the air in a satu-- rated condition through ture15.

suitable atomizing device may be employed. As illustrated herein the atomizing device comprises a water pipe 16 which extends through the side 5 of the casing and is provided with a pointed discharge end which lies in proximity to a similarly pointed discharge end of a pipe or conduit 17 the discharge aperwhich .discharges air under. pressure, so

that it impin es uponthe water from the pipe 16 and "dlvides it into a veryfine spray which is directed downwardly intothe wet bulb compartment 11. This action of the atomizer draws a continuous stream or sample of air from the room through the dry bulb compartment 12, saturates the same and therefore maintains the air in the-.wet bulb compartment at substantially its psychro-' metric wet bulb temperature.

Any suitable thermo-sensitive inembers or motors may be located respectively in the wet and dry bulb compartments. to operate the mechanism which will hereinafter be described. In the present embodiment of the invention thermo-sensitive members are illustrated as being in the form of bi-metallic plates preferably formed of sheets of brass 18 and invar steel 19 welded together. The

' wet bulb thermo-expansive member 20 is rigidly supported at its upper end upon a standard 21 which is secured to the rear side of the partition 8. The dry bulb thermoexpansive member 22 is likewise rigidly secured at its upper end to a standard 23 which is mounted upon the transverse partition 8. The thermo-sensitive wet and dry bulb members are connected respectively to controllers, the conjoint action of which is utilized to operate the regulating mechamsm. The controllers are so mounted as to be moved in predetermined paths, preferably in.

"which is. actuatedby the wet'bulb thermoexpansive member, is guided in a preferably vertical slot 25 in a plate 26 which is secured near its top to two posts 27 secured to the transverse partition 8. This plate desirably is provided with a lower arm extending at right angles thereto which is secured near-its outer end to posts 28 also mounted upon the transverse partition 8. The controller 29, which is actuated by the dry bulb member, is movable in a preferably horizontal slot 30. The slots 25 and 30 extend respectively in the'directions of ordinates and abscissae representing the wet and dry bulb temperatures of the atmosphere and may be provided with suitable graduations. The scales containing graduations indicating respectively wet and dry bulb temperatures preferably are so mounted that the zero point is located at a point corresponding to four degrees dry bulb temperature and four degrees wet bulb temperature, so that the controllers are guided respectively in lines parallel with the axes of the ordinates and of abscissa of usual charts, but beginning at distances located respectively four degrees from the usual axis of ordinates and abscissae.

The controller 24, which is actuated by the wet bulb member, preferably is cylindrical in form and'has rigidly attached to it an arm or transformer 31 provided with a slot 32 which embraces the dry bulb controller 29. The conjoint action of the controllers 24 and 29 when placed in positions indicative respectively of the wet and dry bulb temperatures of the atmosphere move the transformer 31 to, positions indicative of a condition of the air which is dependent upon the relation of the wet bulb, temperature to the dry bulb temperature, such as the relative humidity of the atmosphere, when the mechanism is of the character illustrated in the accompanying drawings.

In the present invention the movement of the transformer is utilized to actuate indimechanism for producing or maintaining a I predetermined condition of humidity of the atmosphere.

In the present embodiment of the invention the controller 24 is in the form of a cylindrical bar which is slidably mounted in the vertical slot 25 of the plate 26 and is extended through a suitable slot 33 in the transverse partition 8. At its front end the slidably movable controller 24 is connected to a flexible shaft which conveniently may be in the form of a spiral 34, the opposite end of which is connected to a shaft 35 which is journalled in a suitable bearing 36 in a bracket 37 which is secured to the base 1. The opposite end of the shaft 35 is connected to an arm 38 which desirably is of suflicient length to form a pointer 39 adapted to co- ,operatewith an indicating and recording device which, as illustrated herein, is in the form of a disk 40 having suitable gradnations.

The disk 40 may be detachably secured to a plate 41 carried by the shaft of a clock mechanism 42 which is suitably supported upon the transverse partition 8. A clamping nut 43 may be provided for securing the graduated disk 40 to the plate 41. The end of the pointer desirably is provided with a pen 44 which will register continuously upon the graduated disk 40 the condition of relativehumidity of the atmosphere, or such other condition of the atmosphere as the device may be designed to indicate or control.

The movement of the arm 38 may also be employed to control suitable mechanism for regulating the amount of moisture or heat supplied to the air of the enclosure. As illustrated herein the arm 38 is employed to control electrical switches in circuits which control the supply of moisture to the atmosphere, but it will be understood that the movement of the arm may also be employed to control other systems which operate the regulating apparatus such as is commonly used in humidifying apparatus.

As shown in the accompanying drawings a link 45, which forms an electric contact member, is pivotally connected to the arm 38 and extends in parallelism with the front of the casing. The free end of the contact member 45 rests upon and is adapted to travel over .contact plates 46 and 47 which are mounted upon an insulating block 48 and separated by a narrow insulating bar 49 having its surface flush with those of the contact plates. The block 48 is adjustably mounted in ways 50 supported from the casing. Binding screws 51 and 52 connected to the contact plates 46 and 47 respectively form an electrical connection between the plates 46 and 47 and circuits leading to mechanism for turning on and off the device or devices which supply moisture" to the atmosphere or which control the heat supplied to the atmosphere of the enclosure.

Anyvsuitable means may be provided for adjusting the regulating mechanism to enable it to maintain a predetermined condition of the atmosphere. As illustrated herein a screw 53 is rotatably mounted in the side Wall 3 of the 'casin and engages the block 48. The crew. 53 is provided with a milled head 5 by which the screw may be rotated to position the block 48 and consequently the contact plates in such position that the end of the contact member 45 will pass from the contact plate 46 to the contact plate .47 when the humidity varies from mined constant condition of humidity is maintained the end of the contact member 45 will rest upon the insulating bar 49 which is interposed between the contact plates 46 and 47. The milled head 54 of the adjusting screw may be manipulated from outside the casing so .that the contact plates may be adjusted for any predetermined condition of humidity without requiring ac cess to the interior of the casing, so that the possibility of tampering with the mechanism of the apparatus by unskilled operators is avoided.

It will also be noted that when it is necessary to remove and replace the graduated recording disk 40 it is only necessary to open the front face of the casing which, if desired, may be in theform of a door and to remove the clamping nut 43 so that a new recording disk may be substituted for the one removed.

The disks may be thus changed by an unskilled attendant without danger of disturbing the adjustments of the instrument.

Any suitable mechanism may be provided for automatically actuating the controllers from the thermo-sensitive devices. As illustrated herein the free end of the wet bulb merino-sensitive bar or plate 20 has rigidly secured to it a bracket 55 provided with a cylindrical stud 56 upon which a cross head- 57 is adjustably mounted and retained in position by a suitable set screw. A link 58, having at its end a'yoke 59, is connected by conical pointed screws 60 to the cross head 57. The opposite end of the link 58 is also provided with a yoke 61 which is connected by conical pointed screws to a cross head 62 which is adjustably mounted upon the lower end of an arm 63 of a bell crank lever. The elbow of the bell crank lever is provided with a trunnion 64 the ends of which are engaged by conical screws 65 carried by yoke-shaped arms 66 and 67 of a bracket 68 which is mounted upon the transverse partition 8. The other arm 69 of the bell crank lever is provided at its end with a yoke 70 which is connected by conical screws 71 to a trunnion 72 which is 1 .the axis of ordinates corresponding to the wet bulb temperature.

The dry bulb thermo-sensitive member or plate 22 is connected at its free end to a.

. degre block 75 which is secured by conical screws 76 to the arms of a yoke 77 upon a rod or link 78, the opposite end of which is adjustably connected to the wet bulb controller 29. Any lateral movement, therefore, of the dry bulb thermo-sensitive member or plate, due to changes in temperature of the atmosphere, will move the controller 29 len hwise of the slot 30 and consequently in a irection parallel to the axis of abscissae indicative of the dry bulb temperature of the atmosphere.

The combined movements of the wet and dry bulb controllers, due to changes in temperature of the wet and dry bulb thermo-sensitive members, will therefore actuate the transformer 31 imparting to the samea bodily vertical movement in accordance with the variation in tem erature of the wet bulb member, and a rotatlve movement about the axis of said wet bulb controller in-accord-' ance with. the variation of temperature of the dry bulb thermo-sensitive member By reason of this construction the pivotal movement of the transformer 31 corresponds to the condition of the atmosphere which is dependent upon the relation of the wet bulb temperature to the dry bulb temperature.

This rotative movement of the wet bulb congr troller is transmitted through the flexible shaft 34 to the shaft 35 of the arm 38 thereby causing the pointer 39 and pen 44 to register and record the condition of the atmosphere directly upon the registering disk 40. At the same time the movement of the arm .38 causes the contact member'45 to traverse the regulator.

In order to prevent undue vibration of the transformer and arm 38, due to jarring of the instrument by the action of machinery in the room, or for any other reason, a dampin means desirably is connected to the wet bulb controller. As illustrated herein an arm 7 9 is connected to the shaft 35 of the arm 38 and the free end of thearm 79 is pivotally connected to the upper end of the stem 80-of a plunger 81.:which.is reciprocably mounted in a dash pct 82 supported upon the base 1 of the instrimient. The dash pot desirably may be filled with mercury 83 or other suitable liquid which will sufliciently damp the pivotal movement of the controller to prevent undesirable vibration.

As illustrated inthe accompanying drawing the mechanisms are in the position to indicate and record one hundred percent of humidity with the regulator set for a lesser e of humidity. When in this position the electric current, whichcontrols means for interrupting the supply of moisture (not shown), passes through the binding post/51, the contact plate 47 and contact member 45 to und, thereby turning off the supply of moisture to the atmosphere. As the condition of the atmos here approaches the desired d gree of re ati e humidity he m ve ments of the free ends of the thermo-sensitive members rock the arm 38 in a direction to cause the end of the contact member or link 45 to approach the central or insulating bar 49 which separates the contact members and when the desired degree of relative humidity is attained the end of the contact member 45 will rest upon said insulating bar 49. If the relative humidity becomes less than the predetermined amount further movement 9f the thermo sensitive members will cause the end of the contact member 45 to pass across the insulating bar 49 into engagement with the contact plate 46 thereby establishing a current to a circuit which will turn on the device which supplies moisture tothe atmosphere and will maintain the supply of moisture until the thermo-sensitive members move in the o posite direction and again cause the end of the contact mem-, ber 45 to pass to the insulating bar 49.

' By reason of this construction a predetermined condition of the ,atmosphere may be maintained in the atmosphere of the enclosure. When it.is desired to maintain the at? mosphere at a diiferentcondition of humidity the pointer may be set at the desired deee of humidity and the set screw 54 adjusted until the end of the contact member 45 rests upon the insulating bar 49. The instrument will then actuate the controlling device to maintain such a predetermined condition of humidity.

While the instrument illustrated in Figs. 1 to 4 of the drawing is arranged to register relative humidity and to control the relative humidity of an enclosure, means may also be provided for causing the instrument to indicate any other functions of the atmosphere which are dependent upon the relation of the wet bulb temperature to the dry bulb temperature'and to control the condition of the atmosphere in correlation.

therewith, for it will be understood that the relative humidity, so called, is in reality an atmospheric condition which in mathematical terms is a'function of the wet and dry bulb temperatures of the air, that is to say, acondition which is wholly dependent upon the relation between the wet and dry bulb temperatures. Likewise, other conditions of humidity are functions of the wet and bulb conditions; for exam le, it is 331 known that certain textile bres, when ex-. posed to the atmosphere, are directly eifect ed as to their hygrosco ic moisture content by the temperatures an moisture condition of the atmosphere,that' is to say, thehy groscopic condition of such fibrosis' g,

function of the wet anddry bulb tures and is de endent n n the relation between them. he of the y 'iolconditionsof textilefibres which 15 Wed known textile tirade. rm h ma n the m m-$1 1!?" g as a percentage representing the weight of the hygroscop1c moisture present in a quantity of material relatively to the bone dry weight of the material. The regain, therefore, is dependent upon, and is in fact, a function of the wet and dry bulb temperatures of the atmosphere which follows a certain definite law throughout the various changes of humidity and temperature of the atmosphere.

In the construction illustrated in Figs. 1 and 4 for controlling humidity, the transformer is illustrated as a slotted arm. The transformer, however, is in effect a cam. As the relation between the wet and dry bulb temperatures of the atmosphere for a predetermined relative humidity follows a law which may be graphically illustrated by a straight line, it is necessary that the transformer should have a straight contour surface. In order to indicate, regulate or record other conditions of humidity the transformer may be provided with a cam so constructed that its active face conforms to the law of such condition of the atmosphere which is dependent upon the relation of the wet and dry bulb temperatures. An illustrative form of cam of this character is shown in Fig. 5. Thus the instrument may be'readily modified to indicate or record or regulate regain or other predetermined atmospheric conditions.

Means may also be provided in connection with the present invention to register and control conditions of humidity at a place remote from the instrument. A convenient means for' accomplishing this purpose is illustrated in Fig. 6 in which the arm 38, or a continuation thereof, is caused to engage and slide upon a suitable resistance wire 87 mounted upon a bracket 88 which may be mounted upon the base of the machine, the resistance wire 87 being electrically insulated from the bracket and connected by a suitable conductor 89 to a remote regulating or recording apparatus 90, the current for actuating said regulating apparatus passing from the battery 91 through a suitable conductor 92 to the arm 38 thence through the resistance wire 87 carried by the bracket 88 to the recorder or regulator.

As the arm 38 is moved under varying conditions of humidity the length of the resistance wire, through which the current flows, is'shortened or lengthened as the case may be, thereby varying the resistance in the. circuit which leads to the remote recording or regulating device and actuates the same in accordance with the variations in humidity which effect the thermo-sensitive members of the instrument.

The means for indicating, recording and regulating temperature conditions at a place remote from the instrument may be utilized either without or in combination with the mechanism upon the instrument; By employing suitable regulating devices the-instrument may be employed to regulate the amount of moisture supplied to the atmosphere or the amount of heat supplied to the atmosphere of the enclosure or both.

It will be understood that the embodiment of the invention disclosed herein is illustrative and not. restrictive and that various changes may be made in construction and arrangement of parts within the' spirit and scope ofthe following claims.

-It will also be understood that while the thermo-sensitive devices wellknown in the art may be employed to achieve the same results.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is: a

1. Hygrometric regulating apparatus comprising a pair of movable controllers, thermosensitive means for moving said controllers independently to positions indicative of the wet and dry bulb temperatures of the atmosphere, a transformer connected to one of said controllers and having an arm variably engaged by the other controller and angularly movable by the conjoint action of said controllers to positions indicative ofa condition of the atmosphere and means operable by the conjoint action of said controllers to regulate the condition of the atmosphere.

2. I lygrometric regulating apparatus comprising a pair of movable controllers, 1

thermosensitive means for moving said controllers independently to positions indicative of the wet and dry bulb temperatures of the atmosphere, a transformer connected to one of said controllers and slidably engaging the other and operable by the conjoint action of saidocontrollers to rotate through an angular interval to positions indicative of a condition of the atmosphere which is dependent upon the relatiomof the wet' bulb temperature to the dry bulb temperature and means operable by said transformer to regulate the condition of the atmosphere.

3. Hygrometric regulating comprising a pair of movable controllers,

apparatus means for automatically moving said con pendent upon the relation of the wet bulbtemperature to the dry bulb, temperature and means operable by said transformer to regulate the condition of the atmosphere.

4;. Hygrometric regulating apparatus comprising a pair of movable controllers, means for automatically moving said controllers independently to positions indicative respectively of the wet and dry bulb temperatures of the atmosphere, a transformer carried by one of said controllers and slidably engaging the other controller, rotatably movable by the conjoint action of said controllers to positions indicative of a condition of the atmosphere which is dependent upon the relation of the wet bulb temperature to the dry bulb temperature, and means rotatable about a fixed axis operable by the rotative movement of said transformer to regulate the condition of the atmosphere. 1

5. Hygrometric regulating apparatus comprising a pair of movable controllers, means for automatically moving said controllers independently to positions indicative respectively of the wet and dry bulb tem peratures of the atmosphere, a transformer connected to one of said controllers having means engaging the other controller and operable bythe conjoint action of said con-- i trollers to rotate said transformer to positions indicative of a condition of the atmosphere which is dependent upon the relation of the wet bulb temperature to the dry bulb temperature, an arm havin a shaft mounted by. the conjoint action of said controllers to positions indicative of the condition of the atmosphere and means rotatable about a stationary taxis operable by the angular movements of said transformer to regulate the condition of humidity of the atmosphere.

7. Hygrometric regulating apparatus comprising a pair of controllers movable respectively in lines parallel with the axis of ordinates and the axis of abscissae, representing wet and dry bulb temperatures, thermo-sensitive members subject respectively to the wet and dry bulb temperatures of the atmosphere, means adjustably connecting said thermo-s ensitive members to said "controllers a transformer an larly movable by the'conjoint action of said controllers to positions indicative of the condition of the atmosphere and means rotatable about a stationary axis operable by the angular movements of said transformer to regulate the condition of humidity of the atmos here.

8. ygrometic apparatus comprising a pair of controllers movable respectively in lines parallel with the axis of ordinates and the axis of abscissae, representing wet and dry bulb temperatures, bi-metallic thermoexpansive bars rigidly mounted at one end and freely movable laterally at the other end, subject respectively to the wet and dry bulb temperatures of the atmosphere, means connecting the free ends of said thermo-expansive bars respectively with-said controllers and means rotatable about a stationary axis operable by the relative movements of. said controllers to regulate the condition of humidity of the atmosphere. .5 I

9. H grometic apparatus comprising .a pair 0 controllers movable respectively in lines parallel with the axis of ordinates and the axis of abscissae, representing wet and dry bulb temperatures, bi-metallic thermoexpansive bars rigidly mounted at one end and freely movable laterally at the other end subject respectively to the wet and dry bulb temperatures of the atmosphere, means adjustablyconnecting said thermo-expansive barsrespectively with said cont-rollers, a transformer rotatable about an axis on one of said controllers, an arm having a shaft pivotally mounted in a stationary bearing, a flexible shaft connecting the shaft to said arm with said transformer and means operable by said arm to regulate the condition.

of humidity of the atmosphere.

10. Hygrometic regulating apparatus com prising a casing having wet and dry bulb compartments therein, means for maintaining said wet bulb compartment at the wet bulb temperature of the atmosphere, bimetallic, thermostatic members located respectively in said compartments, rigidly anchored at one end, controllers movable respectively in lines parallel with the axis of ordinates and the axis of abscissae, representing wet dry bulbtemperatures, means connecting the free ends of said bimetallic thernio-expansive members to said controllers, a transformer .carried by one of said controllers having sliding engage ment with the other controller, an arm having a pivotal shaft mounted in a fixed bearing, a flexible shaft connecting the shaft of said arm to said transformer, a regulating device including a member connected to said arm and means for adjusting the relation between said member and the other members of said regulating device. w v

11. Hygrometric regulating apparatus comprising a casing having wet and dry bulbcompartments therein, a. vaporizer operable to induce a current of air through said dry bulb compartment into said wet bulb compartment and to saturate the same with moisture, thermo-sensitive members in said wet and dry bulb compartmentsrespectively,

controllers movable respectively in lines parallel with the axis of ordinates and the axis of abscissae, connected respectively to said wet and dry bulb thermo-sensitive members,

a transformer carried by one of said controllers and having sliding engagement with the other controller, anarm having a shaft journalled in a stationary bearing. a flexible shaft connecting the arm of said shaft to said transformer, means for cushioning the movement of said transformer andrmeans operable by the movement of. said transformer to regulate the amount of moisture supplied to the atmosphere.

12. Hygrometric regulating apparatus comprising a casing having wet and dry bulb compartments, means for inducing a current of air from said dry bulb compartment, saturating the same and projecting it through the wet bulb compartment, bi-metallic thermo-expansive members located respectively in said wet and dry bulb compartments, a guide having ways positioned in angular relation to each other, controllers movable in said Ways and connected respectively to said wet and dry bulb thermo-expansive members, a transformer carried by one of said controllers and having a sliding engagement with the other controller, an arm having a shaft journalled in stationary bearings, a flexible shaft connecting the shaft to said arm with said transformer and means operable by the movement of said arm to regulate the condition of the atmosphere.

13. Hygrometric regulating apparatus comprising a casing having wet and dry bulb compartments, means for inducing a current of air from said drybulb compartment, saturating the same and projecting it through the wet bulb compartment,

bi-metallic thermo-expansive members Iocated respectively in said wet and dry bulb compartments, a guide having ways positioned in angular relation to each other, controllers movable in said ways and connected respectively to said wet and dry bulb thermo-expansive members, a transformer carried by one of said controllers and having a sliding engagement with the other conbulb compartments, means for inducing a troller, an arm having a shaft journalled in current of air from said dry bulb compartment, saturating the same and projecting it through the wet bulb compartment, bi-metallic thermo-expansive members located ,respectively in said wet and dry bulb compartments, a guide having ways positioned in angular relation to each other, controllers movable in said ways and connected respectively to said wet and dry bulb thermoexpausive members, a transformer carried by one of said controllers and having a sliding engagement with the other controller, an arm having a shaft 'journalled in stationary bearings, a flexible shaft connecting the shaft to said arm with said transformer, an electrical conductor connected to said arm having its free end slidably movable upon a plurality of electric contact plates having electrical connections respectively with humidity regulating means whereby the movement of said electrical conductor will actuate said regulating means to supply or to shut off the supply of humidity to the atmosphere.

15. Hygrometric regulating apparatus comprising a casing having wet and dry bulb compartments, means for inducing a current of air from said dry bulb compartment, saturating the same and projecting it through the wet bulb compartment, bimetallic thermo-expansive members located respectively in said wet and dry bulb compartments, a guide having ways positioned in angular relation to each other, controllers movable in said ways and connected respectively to said wet and dry bulb thermoexpansive members, a transformer carried by one of said controllers and having a slid ing engagement with the other controller, an arm having a shaft journalled in stationary bearings, a flexible shaft connecting the shaft to said arm with said transformer,

an electrical conductor connected to said v arm having its free end slidably movable upon a plurality of electric contact plates no havin electrical connections respectively with lumidity regulating means whereby the movement of said electrical conductor will actuate said regulating means to supply or to shut off the supply of humidity to the atmosphere and means operable from the outside of said casing to vary the position of said contact plates relatively to said elec-- trical conductor. a

16. Hygrometric regulating apparatus comprising a casing having wet and dry bulb compartments, means for inducing a current of air from said dry bulb compartment, saturating the same and projecting it through the wet bulb compartment, bi- 125 metallic thermo-expansive members located respectively in said wet and dry bulb compartments, a guide having ways positioned in angular relation to each other, controllers movable in said ways and connected respec' tively to said wet and dry bulb thermoexpansive members,- a' transformer carried by one of said controllers and having a sliding engagement with the other controller, aria-rm having a shaft journalled in stationary bearings, a flexible shaft connecting the shaft to said arm with said transformer, an electrical conductor connected to said.v arm having its free end slidably movable upon a plurality of electric contact plates, guides on said casing slidably supporting said electric contact plates and a screw extending through said casing operable to vary the position of said contact plates relatively to said electrical conductor.

17. Hygrometric regulating apparatus comprising a pair of movable controllers, means for automatically moving said controllers independently to positions indicative respectively of the wet and dry bulb temperatures of the atmosphere, a transformer carried by one of said controllers and slidably engaging the other controller and rotatably movable by the conjoint action of said controllers through an angular- 'interval to positions indicative of a condition of the atmosphere which is dependent upon the relation of the wet bulb temperature to the dry bulb temperature and means rotatable about a fixed axis operable by the angular movement of said transformer and co-operating means operable respectively to indicate, record and regulate a condition of the atmosphere.

In testimony whereof, I have signed my name to this specification.

EDWARD w. COMFORT. 

